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P. G. EMERY. SLIDING DOOR LOCK. No. 605,816. Patented June 14,1898.

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' P. G. EMERY.

SLIDINGDOOR LOCK. No. 605,816. Patented June 14,1898.

Qvwefltoz I witnesses Q I a UNIT D Y STATES PATENT ()Fmcn.

PLATO G; EMERY, OF CHICAGO, ILLINOIS.

suome-Doon LOCK.

SPECIFICATION forming part of Letters Patent No. 605,816, dated June 14, 1898.

Application filed January 18, 1898. Serial No. 667,079. (No model.)

To all whom it may concern:

Beit known that I, PLATO G. EMERY, of

- Chicago, in the county of Cook and Stateof out in the claims, whereby when the key-bolt is thrown into lockin g position while the door is open and not thrown back before the door is slammed to or closed breakage of the lock or injury-to'the' catch or keeper will be prevented, and also whereby the self-adjustment of certain parts ,of the-lock shall admit of the sagging of the door or door-jamb, so that whether the door or the jamb sags one or both of the catches will continue in-operation, and when the key-bolt is thrown into lockin g position one or both of the catches will remain free,

so that there shall be no danger of breakage due to the weight on the hook or catch resulting from this sagging, it being essential that such catch shall be permitted free action 4 regardless of whether the bolt is locked or released.

In the fuller description of my invention which follows reference is made to the ac companying drawings, in which Figure 1 is aside view illustrating my invention with the inner side of the casing removed, showing the'lock locked. Fig. 2 is a similar View showing a modified form of the invention. Fig. 3 represents a detail of Fig. 2. Fig. 4 illustrates a further modification. Figs. 1 to 4, inclusive, show provision for the free action of either catch under the sagging of the door or the jamb. Fig. 5 shows aform of lock, also within my invention, in which only the upper catch is free to move under such conditions.

'Similar'numerals of reference indicate similar parts in therespective figures.

Referring to Fig. 1, 1 represents the lockcasing, in which, as above stated, the inner the lock or the keeper.

side is removed. 2 2 indicate two catches, each of which at its inner end is provided with a hook or head 2. The catches 2 are pivotally mounted at or near their centers on pins 3, suitably placed within the casing. Springs 5 5 bear with their free ends against the inner or hooked ends of the catches and tend to force the outer ends together. A double-ended cam 6 is suitably mounted within the casing, its hub portion 6 being provided with a square opening through which the spindle of a knob or door-handle is passed. It will be seen that by revolving the cam 6 in either direction the outer ends of the pivoted catches will be spread against the force of the springs 5, and that the hooks or heads of the catches 2 will be released from the arrowshaped head of the keeper 7, attached to the jamb.

As shown in Fig. 1,'the cam (Sis locked by the bolt 8, which is thrown or projected back of the cam. The locking-bolt 8 audits mechanism may be of any approved construction. It will be seen, however, that should the parts be locked in the positions shown in Fig. 1, but with the catches not in engagement with the arrow-shaped head of the keeper 7 (it being frequently the case that the lockingbolt is thrown into engagement while the door is open) and the door should be slid or slammed to, both the catches will be free to yield or move outwardly, allowing their hooked ends to slip over and engage the arrow-shaped head of the keeper 7 without resulting breakage of or damage to any part of posing the door to be closed-i. e., the catches to be engaged with the keeper.-should the door or the jamb sag it will be seen that either catch will be free to yield and that in the event of the door sagging it will be the upper one to so yield, but that if the jamb sags it will be the lowerone. It is also to be observed as an important feature of this invention that either catch may yield whether the cam 6 is locked against revolution or not.

Furthermore, sup- In Figs. 2 and 3 a modification is shown in I the shapes of the catches 2 and the cam 6.

Fig. 2 illustrates the cam held or locked,

while their hooked endsare slipping over the arrow-shaped head of the keeper. It is obvious that in Fig 2 and 3, asin Fig. 1, either catch will yield, one under the sagging of the door and the other under the sagging of the jamb.

In Fig. -t a further modification is seen, in which there is an open pin connection between the two catches. This construction may be used with remaining mechanism, substantially as in Fig. 2, and is capable of the several functions hereinbefore described.

In Fig. 5 only the upper catch is permitted to yield under the sag or weight of the door, the lower catch being held by the lockingbolt 8, which in this form of my invention serves when thrown the double purpose of holding the cam 6 against rotation and the under catch from movement upon its pivot or fulcrum.

It will be seen from the foregoing that my invention has a two-fold obj ectviz., to prevent injury to the lock or the keeper when the door is slammed to while the key or looking-bolt is thrown and to guard the lock or the keeper against damage due to the sagging of the door or the jamb. Chiefiybecause of these defects,heretofore experienced, this class of door has never been in favor, although it is obviously one of the most convenient of types, especially where space is to be economized and where the ordinary folding door is inadmissible for want of space. It has been found heretofore that no matter how accurately a sliding door is originally fixed to place it will sooner or later become disarranged,either by its own sagging, shrinking, or displacement, or by that of the jamb,-

and heretofore, so far as I am aware, no means have been devised for effectually obviating this evil. It is necessary that not only shall the sagging or displacement of the door, which is the most usual ground of objection to this class of sliding doors, be provided for,

but also that of the jamb, due to the dis placement of thebuilding, shrinkage or swelling of material, or other causes, while at the same time the catches shall be allowed to perform their function of attaching to or with the keeper whether the lock is locked or unlocked.

Having described my invention, I claim 1.. In a sliding-door lock, the combination of pivoted catches one of which is capable at all times of pivotal movement, a rocking cam for opening the catches, and means adapted to engage the cam to hold the same against movement, substantially as set forth.

2. In a sliding-door lock, the combination of pivoted catches one of which is capable at all times of pivotal movement, a cam mounted on the knob-spindle hub and adapted to open the catches, and means for locking the cam against movement, substantially as set forth.

3. In a sliding-door lock, the combination of pivoted catches capable at all times of pivotal movement, a cam having a flat rear face and adapted to open the catches, springs to hold the catches normally closed, and a locking-bolt adapted when thrown to slide across the flat rear face of the cam and hold the cam against movement, substantially as set forth.

4. I11 a sliding-door lock, the combination of pivoted catches, a rocking cam operating to open the catches, and a key-bolt adapted, when thrown, to lock the cam, one of said catches being at all times free to have pivotal movement irrespective of the position of the cam or the key-bolt, substantially as set forth.

In testimony whereof I hereunto set my hand and seal this 12th day of January, 1808.

PLATO G. EMERY.

Witnesses:

HENRY O. MILLER, R. F. EUN'IING. 

